Connected: An Internet Encyclopedia
RFC 1421 - NOTES

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### NOTES

         [1]  Key generation for MIC computation and message text encryption
              may either be performed by the sending host or by a
              centralized server.  This RFC does not constrain this design
              alternative.  Section 5.1 identifies possible advantages of a
              centralized server approach if symmetric key management is
              employed.

         [2]  Postel, J., "Simple Mail Transfer Protocol", STD 10,
              RFC 821, August 1982.

         [3]  This transformation should occur only at an SMTP endpoint, not
              at an intervening relay, but may take place at a gateway
              system linking the SMTP realm with other environments.

         [4]  Use of a canonicalization procedure similar to that of SMTP
              was selected because its functions are widely used and
              implemented within the Internet mail community, not for
              purposes of SMTP interoperability with this intermediate
              result.

         [5]  Crocker, D., "Standard for the Format of ARPA Internet Text
              Messages", STD 11, RFC 822, August 1982.

         [6]  Rose, M. T. and Stefferud, E. A., "Proposed Standard for
              Message Encapsulation", RFC 934, January 1985.

         [7]  CCITT Recommendation X.509 (1988), "The Directory -
              Authentication Framework".

         [8]  Throughout this RFC we have adopted the terms "private
              component" and "public component" to refer to the quantities
              which are, respectively, kept secret and made publicly
              available in asymmetric cryptosystems.  This convention is
              adopted to avoid possible confusion arising from use of the
              term "secret key" to refer to either the former quantity or to
              a key in a symmetric cryptosystem.

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Connected: An Internet Encyclopedia
RFC 1421 - NOTES